Question about 1989 Buick Riviera

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I have a 1989 rivera, was told my ecm was good but the prom was bad. when ecm was pulled it was out of a 88 olds 88 special. Have bought four so far none work 100%. I tried Buick to get the computer [ecm]and the prom number all they can tell me is it's no longer stocked and there is no olds dealer to ask about the olds ecm I have now and it has been in the car since before I bought it eight years ago and worked perfect till this problem. I found a rivera ecm up north was assured it was the right one, but it has the same problems the others have I bought. The car has CRT screen and this ecm I just bought wont let it show the tac reading and the temp will only read cold, every few mintues it does a system check on the screen over and over and after a while the screen goes black, but if you turn the key off and back on it lights back up. At speeds below 60mph it stumbles and jerks as if you were turning the car on and off above that speed it runs good for a while them stumbles once in a while, some times the screen goes black but not all of the time. Does anyone know the correct ecm # and the prom # for the rivera and or the same for the olds 88? or for sure what is wrong. I'm going broke and getting a nice collection of ecm's that don't work. Thanks for any help. Ron Johnson Fern Park, Fl. rrj914@yahoo.com 407- 331-0691

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  • rrj914 Feb 05, 2010

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Ron it was great talking with you and we will get you on the right track soon here. make sure you pull the codes out of the computer and i will talk to you tomorrow.

Posted on Feb 05, 2010

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